The City of Calais Water Department welcomes you and hopes your visit is pleasant and informative. Our priority here at the Water Department is to filter any and all impurities in the water we pump to your home. Iron and Manganese are natural in these two wells. The first well is very high in Iron sediment and the second well beyond the railroad is high in manganese. Both these elements must be eliminated from the drinking water therefore we have to filter them out.